There is a rather interesting exposition paper put out yesterday by Helfgott: "EXPANSION, DIVISIBILITY AND PARITY: AN EXPLANATION" https://arxiv.org/pdf/2201.00799.pdf
Have only scanned it, but it seems well motivated and readable.
Have only scanned it, but it seems well motivated and readable.
> Incidentally, in earlier drafts of the paper, we did not have a “writer” and a “reader”, but a mahout and an elephant <<picture of man and elephant>> They were unfortunately censored by my coauthor. As this is my exposition, here they are
:)